20124289 has 6 divisors (see below), whose sum is σ = 20843030. Its totient is φ = 19429536.

The previous prime is 20124271. The next prime is 20124323. The reversal of 20124289 is 98242102.

It can be written as a sum of positive squares in 3 ways, for example, as 4875264 + 15249025 = 2208^2 + 3905^2 .

It is not a de Polignac number, because 20124289 - 2⁵ = 20124257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11124 + ... + 12805.

Almost surely, 2^20124289 is an apocalyptic number.

20124289 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20124289 is a deficient number, since it is larger than the sum of its proper divisors (718741).

20124289 is an equidigital number, since it uses as much as digits as its factorization.

20124289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23987 (or 23958 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20124289 is about 4486.0103655698. The cubic root of 20124289 is about 272.0028879812.

The spelling of 20124289 in words is "twenty million, one hundred twenty-four thousand, two hundred eighty-nine".